Journal
SOLID STATE IONICS
Volume 349, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.ssi.2020.115309
Keywords
Lithium dendrite; Lithium metal anode; Single-ion conducting polymer electrolyte; Boron
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Funding
- National Natural Science Foundation of China [21763009]
- Hainan Provincial Natural Science Foundation of China [519MS020, 2018CXTD332]
- Graduate Students Innovation Research Project of Hainan Province [Hys2019-115, Hys2019-118, Hys2019-119, Hys2019-120]
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Lithium metal is regarded as a Holy Grail anode material because of its high theoretical specific capacity and uniquely low reduction potential. However, its low Coulombic efficiency and hazards caused by uncontrolled lithium dendrite growth have hindered its practical application in anodes for many years. In this work, we design a novel boron-containing single-ion conducing polymer electrolyte that eliminates the large electric field that Chazalviel has identified as the cause of lithium dendrite growth. The ability to inhibit lithium dendrite growth is demonstrated via galvanostatic cycling tests of Li/Electrolyte/Li cells. In addition, the boron-containing single-ion conducing polymer electrolyte exhibits excellent ionic conductivity (2.23 mS cm(-1)) and an extremely high lithium-ion transference number (0.71). Moreover, the LiFePO4/Electrolyte/Li cell exhibits an outstanding specific capacity of more than 130 mAh g(-1) and excellent capacity retention (90% of the highest capacity was retained after 100 cycles). This excellent performance indicates a promising strategy for development of safe, long-life lithium metal batteries.
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